O2 sensor wiring?

2010 FORD RANGER
229,000 MILES • 4.0L • 6 CYL • 4WD • MANUAL
Avatar
BRIAN WILLIAMS2
  • MEMBER
  • 1 POST
I have no voltage going to my o2 sensor bank 1 sensor 1.
Sep 8, 2025 at 11:45 PM
Advertisement
Avatar
AL514
  • ✓ASE Certified Mechanic
  • 5,587 POSTS
  • ASE Certified Mechanic
Hello, I assume you are referring to the heater circuit for the B1S1? Its the grey wire at the harness sensor plug.
Sep 9, 2025 at 5:07 PM
Avatar
AL514
  • ✓ASE Certified Mechanic
  • 5,587 POSTS
  • ASE Certified Mechanic
This grey wire is the power feed for the oxygen sensor heaters, and the 2nd diagram shows where the power originates from, but you would be missing power for a bunch of other actuators as you can see if it was a fuse issue. So it sounds like there is a break in the Grey wire somewhere in between the sensor and the smart junction box behind the passenger side kick panel.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Sep 9, 2025 at 5:17 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.